Lexi J. Ater, Ellie K. Plantz, Turner D. Manning, Elizabeth S. Edwards, FACSM, Jeremy D. Akers, Stephanie P. Kurti. James Madison University, Harrisonburg, VA.

Background: Postprandial metabolic responses have been shown to be a better predictor of myocardial infarction and cardiovascular disease risk compared to fasting levels alone. Even a single high-fat, high-carbohydrate meal (HFHCM) results in adverse triglyceride (TRG), glucose (GLU), and metabolic load index (MLI; summation of TRG and GLU) in older adults (OA). Existing research suggests that either acute postprandial exercise (EX) or a high-polyphenol nutritional intervention may attenuate the adverse postprandial responses, however there is no study assessing the combined effect of a minimally processed, high-polyphenol and EX intervention in OA. Therefore, the purpose of this study was to determine whether a nutrition intervention in combination with acute exercise alters postprandial TRG, GLU and MLI more than either intervention alone. Methods: In a randomized crossover design, OA (n=10, 4 M/6 F, 57 ± 6.9 years) completed the following 4 conditions: (1) traditional HFHCM (T-HFHCM) alone, (2) T-HFHCM + EX, (3) a HFHCM with polyphenols (P-HFHCM) alone, (4) a P-HFHCM + EX. Participants consumed 12 kcals/kg BW in all HFHCM conditions. The P-HFHCM was created by a dietitian to be matched in fat and CHO content to the T-HFHCM (~58% saturated fat, ~38% CHO, ~33g added sugar). EX was performed 30 mins after the pie was consumed and consisted of walking at a self-selected speed and grade to expend 25% of the kcals consumed from the HFHCM (~30 mins EX/participant). Blood GLU and TRG were measured at baseline, 30, 60, 90 mins, and every hour for 6 hours post-prandially. Results: There was a significant increase in TRG, GLU and MLI post-HFHCM (p’s > 0.05), which was attenuated by EX similarly in the T-HFHCM + EX and P-HFHCM + EX conditions (p < 0.001) without any impact of the meal intervention alone (p = 0.180). Interestingly, there was a time*condition interaction for TRG and MLI, where the P-HFHCM, P-HFHCM+ EX and T-HFHCM + EX all had a significant and similar attenuation of TRG compared to the T-HFHCM alone (p < 0.001). Conclusions: A HFHCM intervention combined with EX lowers postprandial GLU and TRG more than a T-HFHCM, however increasing polyphenol content elicits similar TRG reductions as completing postprandial EX alone. Still, because GLU reductions were not seen in the P-HFHC alone, there is justification to encourage OA to consume high polyphenol meals and engage in postprandial EX.

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